when did they go to electronic ignition?

My GF (later wife) ordered a 1972 Ply Satellite Sebring Plus in the fall of 1971. At the time electronic ignition was standard on the hi-po engines. She had me look over her option list and I told her to add dual body-colored racing mirrors and electronic ignition. IIRC it was about $30 extra. The car was a 72 and arrived in November of 71.
My best friend ordered a 1972 340 4 Speed Duster and elec ign was standard.

I remember an Arthur Godfrey Chrysler TV commercial where he stood by a car in a raincoat while a fire hose doused the engine compartment with water. Engine kept running.